Background: Several studies have reported significant improvements in
cardiorespiratory fitness (CRF) in children with high-intensity exercise. However,
most research protocols focus on cycling and running. These protocols are not
applicable for practical purposes in children. Objective: This study
aims to assess the effect of an 11-week intervention using games protocols of
two different intensities (high-intensity games and moderate-intensity games)
on CRF and anthropometric variables in children. Methods: The
participants included 48 schoolchildren aged between 9 to 10 years (9.48 ± 0.5
years). Children were randomized into two groups: high-intensity games (HIG) or
moderate-intensity games (MIG). HIG group used relays race and small-sided games; >75% of maximum heart rate (HRmax).
MIG group used cooperative and dynamics continued games; 60%- 74% HRmax. Both groups had two sessions per week for 11weeks during physical education classes (PE). Before and after the
interventions, participants completed the CRF test (20-meter shuttle run test) and measurements of anthropometric variables were
taken: Body mass index (BMI), Body mass index Z-Score (BMI z-score), Waist
circumference (WC), Body fat percentage (BF%) and Sum of skinfolds. Results: A significant time × group interaction was observed for CRF (F = 4.879, P = 0.032; ES
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